|Publication number||US7116761 B2|
|Application number||US 09/200,631|
|Publication date||Oct 3, 2006|
|Filing date||Nov 30, 1998|
|Priority date||Nov 30, 1998|
|Also published as||US20030123648, WO2000033488A1|
|Publication number||09200631, 200631, US 7116761 B2, US 7116761B2, US-B2-7116761, US7116761 B2, US7116761B2|
|Inventors||Curtis L. Ashton, Bruce A. Phillips, Jimmy G. Godby, Richard H. Fink, Robert C. Ferry|
|Original Assignee||Qwest Communications International Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (19), Non-Patent Citations (2), Referenced by (13), Classifications (10), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a powering architecture for energizing a fiber optic communication network and customer telephones with an AC power feed under normal operating conditions and DC backup power when the AC power is not available.
With increasing customer demand for information to be supplied to homes and businesses, telephone communication companies are being pushed to upgrade their communication network infrastructures. In order to supply more information in the form of video, audio and telephony at higher rates, higher bandwidth communication networks are required. Conventional telephone communication network infrastructures utilize fiber optics and twisted copper pair wire to send communication data to a customer. Fiber optic cable supports a high bandwidth while, twisted copper wire supports relatively low bandwidth over long distances. In operation, the fiber optic cable portion of the communications network transmits digital light bits to an optical network unit (ONU). The optical network unit converts the digital light bits to an analog signal which is received by a conventional customer telephone.
Generally, customers who are within two to three miles of a telephone company's central office are fed communication data solely using twisted copper pair. The twisted copper pair carries the phone signals as well as a −48 volts DC power to operate and ring the phones. Large cables (thousands of pairs), are routed through the telephone central office switch and branch out to various manholes, poles, and cross-connect points to customer locations. For customers who are further away, a digital loop carrier (DLC) cabinet, hut, or buried vault is placed in an area and reaches up to a two-mile radius. High speed copper lines (T1, DS1, etc.) or fiber cable feed digital bits from the telephone central office to the DLC. Similar to the ONU, the DLC converts the digital signal to an analog waveform required to operate the telephones. A copper drop (twisted copper pairs) relays the analog signals to a customer's home over a radius of two to three miles around the DLC site. The DLC cabinet contains its own batteries, power rectifiers, converters, and a connection for a portable generator. Additionally, the DLC cabinet is connected to an AC power feed from the local power company. For a business or residential customer requiring higher speed data than the standard telephony service, high speed copper or fiber data circuits are routed from the DLC or the CO to the customer location.
The twisted copper cable will not support high bandwidths over a great distance. In order to achieve high bandwidths at a customer location, the fiber optic loop must be brought closer to the customer so that the copper drop is a sufficiently short distance and will be capable of supporting high data transfer rates. One major problem with bringing fiber cable within a short distance of a customer location is the added burden of maintaining the multitude of optical network units (ONUs) which will be required and will typically only serve between twelve to ninety-six customers. Conventional telephone networks utilizing DLCs do not have this problem because there are far fewer DLCs given their capability of serving approximately four hundred to two thousand customers each. Each ONU will require power to make the digital to analog conversion to run the telephones and provide lifeline telephony. Lifeline telephony is required of all telephone communication networks. Lifeline telephony means that the customer telephones must remain energized and operational during an AC power interruption and outage.
As such, a need exists for a system and method for powering a fiber optic communication network which brings fiber within a short distance of a customer location. The fiber optic communication network power architecture must be capable of supporting lifeline telephony and operate the multitude of optical network units in a cost effective and maintainable manner.
Accordingly, it is an object of the present invention to provide a system and method for reliably powering a fiber optic communication network with AC power under normal operating conditions and DC backup power when the AC power is interrupted, thus providing lifeline telephony service.
It is another object of the present invention to provide a system and method for powering a fiber optic communication network which reduces maintenance costs by providing a limited number of centralized remote power sources.
In accordance with these and other objects, the present invention provides a system and method of powering a fiber optic communication network which transmits communication data between a telephone company central office and a user device. The user device may be a conventional telephone, television, computer or any combination of these devices. The system for powering the fiber optic communication network includes a digital subscriber line access multiplexer (DSLAM) for converting the communication data from an optical state to an electrical state, a fiber optic communication medium (fiber multiplexer) configured to transfer the communication data between the telephone company's central office and the DSLAM. The system further includes a power source configured to supply an electrical supply voltage to power the digital subscriber line access multiplexer, the power source having an AC power feed for providing power to the digital subscriber line access multiplexer, and a DC power feed for providing power to the digital subscriber line access multiplexer when the AC power feed is not supplying power to the digital subscriber line access multiplexer. Further still, an electrical conducting medium configured to conduct the electrical supply voltage and the communication data from the digital subscriber line access multiplexer to a network interface device in electrical communication with the remote user device is provided.
The above objects and other objects, features and advantages of the present invention are readily apparent from the detailed description of the best mode for carrying out the invention when taken in connection with the accompanying drawings.
Referring now to
In accordance with the present invention when the ONU 22 is less than nine thousand feet from the central office 20, a twisted copper cable 36 is trenched with the fiber optic cable 34 to power the optical network unit 22. The twisted copper cable 36 powers the ONU 22 with a supply voltage of minus 130 VDC. The supply voltage is higher than the minus 48 VDC, required to power the telephones, to compensate for transmission losses. The copper drop 38 is a twisted copper pair cable with a length of less than 750 feet. This communication network configuration is referred to as fiber to the curb as it locates fiber optic cable within a short distance from a customer location 26. A copper drop 38 of less than 750 feet provides a customer with 52 megabits per second of bandwidth. Providing a customer with higher bandwidths allows the customer to receive a greater amount of communication data. The upstream bandwidth in this configuration is approximately 19 megabits per second. The upstream bandwidth is the rate at which a customer can send communication data back through to the central office 20.
In operation the present invention ensures lifeline telephony when an AC power outage occurs. The twisted copper pair cable 36 carries DC electrical power from a power source (not shown) in the central office 20 to the optical network unit 22, therefore the ONU 22 does not require batteries and converters and rectifiers. In this configuration the optical network unit 22 requires little maintenance. The converters, rectifiers, current limiters, and batteries are located in the central office and may be easily maintained. When a power outage occurs, power from the batteries is carried over the twisted copper cable 36 to the optical network unit 22 to ensure that the optical network unit is operational during the AC power outage. The optical network unit converts and transmits the power carried on the twisted copper cable 36 to the copper drop cable 38, which in turn carries the supply voltage to keep alive the telephones 30. The powering architecture just described ensures lifeline telephony to the customer location 26.
In an alternative embodiment, a fiber to the curb power architecture where the optical network unit 22 is greater than nine thousand feet from the central office 20 is illustrated in
Referring now to
With continued reference to
In an alternative embodiment as shown in
In an alternative embodiment, a fiber to the neighborhood 80 power architecture is illustrated in
Now referring to
Referring now to
Referring now to
Referring now to
In still another embodiment of the present invention, a fiber to the neighborhood power architecture 400 is illustrated in
Now with reference to
With reference to
While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. The words used in the specification are words of description rather than limitation, and various changes may be made without departing from the spirit and scope of the invention.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US5321596||May 17, 1993||Jun 14, 1994||Raynet Corporation||DC/DC/AC power supply for a subscriber interphase unit|
|US5355238 *||Aug 18, 1993||Oct 11, 1994||Swl Inc.||Method and apparatus for the monitoring and demarcation of synchronous optical networks|
|US5355401 *||May 28, 1993||Oct 11, 1994||U S West Advanced Technologies, Inc.||Method and apparatus for providing telephony power through a coaxial cable network|
|US5369518||Dec 18, 1992||Nov 29, 1994||Automated Light Technologies, Inc.||Optical communication system and method electrical power transmission for thereof|
|US5469495 *||Dec 16, 1994||Nov 21, 1995||U S West Advanced Technologies, Inc.||Method and apparatus for delivering secured telephone service in hybrid coaxial cable network|
|US5523868 *||Oct 12, 1994||Jun 4, 1996||Dsc Communications Corporation||Apparatus and method for monitoring power loss in a telecommunications system|
|US5539805||Sep 21, 1994||Jul 23, 1996||Raynet Corporation||Power supply system including ringing voltage reset under low input voltage conditions|
|US5550476 *||Sep 29, 1994||Aug 27, 1996||Pacific Gas And Electric Company||Fault sensor device with radio transceiver|
|US5557437 *||Jun 7, 1995||Sep 17, 1996||Fujitsu Limited||Optical terminal system having self-monitoring function|
|US5557672||Mar 10, 1993||Sep 17, 1996||Antec Corporation||Channel interface unit|
|US5623531 *||Jun 22, 1994||Apr 22, 1997||Nilssen; Ole K.||Auxiliary power for telephone distribution system|
|US5640512 *||Sep 14, 1995||Jun 17, 1997||Alcatel Network Systems, Inc.||Maintenance method and apparatus for providing a high-integrity, unidirectional, standardized ATM/SONET/DS3 transport signal link for a video distribution network|
|US5654592 *||Feb 4, 1994||Aug 5, 1997||British Telecommunications Public Company Limited||Power supply controller|
|US5664002 *||Nov 13, 1995||Sep 2, 1997||U S West, Inc.||Method and apparatus for providing power to a coaxial cable network|
|US5740075 *||Mar 28, 1995||Apr 14, 1998||Bell Atlantic Network Services, Inc.||Access subnetwork controller for video dial tone networks|
|US5825516 *||Jul 25, 1996||Oct 20, 1998||Hewlett-Packard Company||Optical power meter for detecting loss factors in fiber optic communications|
|US5889465 *||Jul 23, 1996||Mar 30, 1999||Jersey Central Power & Light Company||Power service unit with automated dialer and other enhancements|
|JPH07264333A *||Title not available|
|JPH08172490A *||Title not available|
|1||Ashton, Curtis, Telephony, Powering the Network, Backup Power's, Sep. 7, 1998, 5 pages.|
|2||International Search Report-Feb. 24, 2000.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7346785 *||Aug 4, 2003||Mar 18, 2008||Microsemi Corp. - Analog Mixed Signal Group Ltd.||Structure cabling system|
|US7394167 *||Aug 4, 2005||Jul 1, 2008||Infratel Communications, Inc.||Express power load center|
|US8542126 *||Oct 31, 2007||Sep 24, 2013||Verizon Patent And Licensing Inc.||Optical network terminal backup battery centralized monitoring and voltage alert|
|US8601289||Feb 21, 2011||Dec 3, 2013||Adtran, Inc.||Optical network unit with redundant reverse powering from customer premises equipment|
|US8818192 *||Jun 20, 2011||Aug 26, 2014||Adtran, Inc.||Optical network unit with redundant reverse powering from customer premises equipment with alarm fault discrimination indicative for power fault condition|
|US9065588||Jan 3, 2011||Jun 23, 2015||Adtran, Inc.||Communications system having remotely managed and configured optical network unit|
|US9155221||Mar 13, 2013||Oct 6, 2015||Emerson Network Power, Energy Systems, North America, Inc.||Digital subscriber line access multiplexer enclosures having onboard power|
|US20040037300 *||Aug 4, 2003||Feb 26, 2004||Amir Lehr||Structure cabling system|
|US20060039402 *||Aug 4, 2005||Feb 23, 2006||Infratel Communications, Llc||Express power load center|
|US20060153229 *||Jan 10, 2005||Jul 13, 2006||Sbc Knowledge Ventures, Lp||System and method for extended distance digital subscriber line based services|
|US20080265673 *||Jun 9, 2008||Oct 30, 2008||Infratel Communications, Inc.||Express power load center|
|US20090052889 *||Oct 31, 2007||Feb 26, 2009||Verizon Services Corp.||Optical network terminal backup battery centralized monitoring and voltage alert|
|US20100046940 *||Feb 25, 2010||Generonix, Inc.||Reliable Power Source for Fiber to Home Network Termination and Other Critical Applications|
|U.S. Classification||379/56.2, 379/102.04|
|International Classification||H04M11/00, H04B10/20, H04B10/12, H04M19/08|
|Cooperative Classification||H04M19/08, H04B10/27|
|European Classification||H04B10/27, H04M19/08|
|Nov 30, 1998||AS||Assignment|
Owner name: US WEST, INC., COLORADO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ASHTON, CURTIS L.;PHILLIPS, BRUCE A.;GODBY, JIMMY G.;ANDOTHERS;REEL/FRAME:009623/0916;SIGNING DATES FROM 19981123 TO 19981125
|Jul 24, 2000||AS||Assignment|
Owner name: QWEST COMMUNICATIONS INTERNATIONAL INC., COLORADO
Free format text: MERGER;ASSIGNOR:U S WEST, INC.;REEL/FRAME:010814/0339
Effective date: 20000630
|Mar 24, 2010||FPAY||Fee payment|
Year of fee payment: 4
|Mar 20, 2014||FPAY||Fee payment|
Year of fee payment: 8